I accidentally told a stranger my mobile phone number, and he would send me short messages to wish me a happy holiday from time to time, but I don't trust him. What should I do?

Leave it alone. Just send a message to wish you happiness on holidays. If I don't send it to you at ordinary times, there will be no problem. If you ask questions frequently, you should pay attention. Don't look back for a while and don't be too nervous. If you often come to Sao and bother you, you can call first to make it clear. If he still depends on you, he will be blacklisted directly. You can change the number if necessary. If you come to the door, you can inform your family and friends and ask them to help you call the police. It is also a good choice.